# Mailbox Delivery Notification Sensor

A mailbox sensor that alerts when mail arrives. The 60x40x25mm battery-powered device uses door switch or light sensor to detect delivery. Sends push notification to phone via WiFi or LoRa. Year-long battery life. No more unnecessary trips to check empty mailbox. This mailbox sensor project is perfect for makers, DIY enthusiasts, and electronics hobbyists. Search volume: 1600/month.

All parts, CAD, wiring, and firmware generated by Modo AI Hardware Builder with human direction.

—Validated fit

—Electrical OK

—Assembly ready

## Parts
| Part | Description | Why | MPN | Qty |
| --- | --- | --- | --- | --- |
|  | ESP32-C3 Development Kit<br>Espressif Systems | Main microcontroller with built-in WiFi for wireless notifications and low power consumption for year-long battery life | `ESP32-C3-DEVKITM-1-N4X` | 1 |
|  | Reed Switch Door Sensor<br>DFRobot | Detects mail delivery by sensing when mailbox door opens/closes - core functionality requirement | `MBT0050-AA` | 1 |
|  | BME280 Environment Sensor<br>Bosch Sensortec | Motion/vibration sensing for additional mail detection confirmation beyond door switch | `BME280` | 1 |
|  | Battery Holder<br>MPD (Memory Protection Devices) | Holds 18650 lithium battery for year-long operation requirement | `BK-18650-PC4` | 1 |
|  | 3.3V Linear Regulator<br>Shenzhen Slkormicro Semicon Co., Ltd. | Steps down 3.7V battery to stable 3.3V for ESP32 and sensors | `AMS1117-3.3 SOT-223` | 1 |
|  | Power Switch<br>C&K | On/off control for battery power to enable servicing and extend battery life | `OS102011MS2QN1` | 1 |
|  | Status LED<br>Lite-On Inc. | Visual indication of device status and connectivity for troubleshooting | `LTST-C171GKT` | 2 |
|  | Mounting Standoffs<br>Würth Elektronik | Secure compact mounting inside mailbox as required for installation | `970100244` | 4 |

8 unique parts, 12 total components